Pengshun Luo,^* Jihua Ding, Jianbo Wang, and Xiaofang Ren
MOE Key Laboratory of Fundamental Quantities Measurement, Hubei Key Laboratory of Gravitation and
Quantum Physics, School of Physics, Huazhong University of Science and Technology,
Wuhan 430074, China
(Received 13 June 2017; revised manuscript received 16 July 2017; published 18 September 2017)

New laboratory constraints are obtained on exotic interactions between electrons through pseudoscalar or pseudovector coupling by analyzing a recent measurement of the magnetic dipole-dipole interaction between two iron atoms at the nanometer scale. The analysis imposes the strongest bounds on the pseudovector coupling constant between electrons for exchange bosons heavier than 1 eV. Even with the counterpart of electron-positron interaction considered by assuming CPT invariance, the constraints are still the most stringent for bosons in the mass range from 1 eV to 20 eV. The constraints on the pseudoscalar coupling constant are only stronger than the limits derived from the trappedstrontium-ion experiment for exchange bosons heavier than 0.14 eV. Furthermore, a new experiment for more stringent constraints is proposed by measuring the interaction between one iron atom and multiple Holmium atoms.

DOI: 10.1103/PhysRevD.96.055028